init layout, notifications, tabs & more

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

layout/messages.go

@@ -0,0 +1,80 @@
+package layout
+
+import tea "charm.land/bubbletea/v2"
+
+// SizeMsg tells a pane the exact width/height it's been allocated, and its
+// own id (so it can identify itself as the Source of a later
+// RequestFocusMsg). Sent to every leaf whose Rect changed, whenever the tree
+// is resized, split, closed or reshaped - never assume a pane can deduce its
+// size any other way.
+type SizeMsg struct {
+	ID            string
+	Width, Height int
+}
+
+// FocusMsg tells a pane it just gained keyboard focus. Named distinctly from
+// bubbletea's own tea.FocusMsg (which is about terminal focus, not pane
+// focus) to avoid any confusion between the two.
+type FocusMsg struct{}
+
+// BlurMsg tells a pane it just lost keyboard focus. See FocusMsg.
+type BlurMsg struct{}
+
+// SendMsg delivers Msg to the pane identified by Target, wherever it lives
+// in the tree (including inside a nested layout.Model), regardless of which
+// pane currently has focus. A pane never holds a reference to another, so
+// this is how they talk: return
+//
+//	func() tea.Msg { return layout.SendMsg{Target: "editor", Msg: myMsg{}} }
+//
+// as a tea.Cmd from Update. An unknown Target is silently ignored.
+type SendMsg struct {
+	Target string
+	Msg    tea.Msg
+}
+
+// RequestFocusMsg asks the layout to move keyboard focus to Target. Only
+// honored when Source is the id of the pane that currently holds focus (a
+// blurred pane can send other panes messages via SendMsg, but can't move
+// focus itself or on anyone's behalf) - fill Source from the ID a pane
+// learned via SizeMsg:
+//
+//	func() tea.Msg { return layout.RequestFocusMsg{Source: p.id, Target: "content"} }
+//
+// A mismatched Source, or an unknown Target, is silently ignored.
+type RequestFocusMsg struct {
+	Source string
+	Target string
+}
+
+// SetPaneMsg is the message form of Model.SetPane, for a pane that wants to
+// swap another leaf's content without holding a reference to its Model
+// (which it never does).
+type SetPaneMsg struct {
+	ID      string
+	NewPane Pane
+}
+
+// SplitLeafMsg is the message form of Model.SplitLeaf, for a pane that wants
+// to reshape the tree without holding a reference to its Model (which it
+// never does). See Model.SplitLeaf for parameters.
+type SplitLeafMsg struct {
+	ID       string
+	Dir      Direction
+	NewID    string
+	NewModel Pane
+	Opts     []SplitOption
+}
+
+// CloseLeafMsg is the message form of Model.CloseLeaf.
+type CloseLeafMsg struct {
+	ID string
+}
+
+// ResizeMsg is the message form of Model.Resize: sets the ratio of the
+// first child of the Split identified by SplitID (a Split only reachable by
+// id if it was given one via WithID or WithSplitID).
+type ResizeMsg struct {
+	SplitID string
+	Ratio   float64
+}